#16340: Infrastructure for modelling full subcategories
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Reporter: nthiery | Owner:
Type: enhancement | Status: closed
Priority: major | Milestone: sage-6.4
Component: categories | Resolution: fixed
Keywords: full | Merged in:
subcategories, homset | Reviewers: Darij Grinberg,
Authors: Nicolas M. Thiéry | Travis Scrimshaw, Simon King
Report Upstream: N/A | Work issues:
Branch: | Commit:
eb621c7beacb797f43fd41c9156edc453e80a902| Stopgaps:
Dependencies: |
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Comment (by nthiery):
Replying to [comment:65 ncohen]:
> Wasn't there a way to make all these classes inherit the
`additional_structure` -> `return None` function ?..
Yeah, I agree it's verbose looking. But I am actually quite happy that
the design allowed us to explicitly insert so few additional
information :-)
With this ticket, we are really adding a not so trivial mathematical
information to almost 260+ categories (what shall, or not, be
preserved by morphisms); thanks to the chosen defaults (which depend
on whether we have a category with axiom, a construction category, or
...) we had to special case only about 20 categories. For each of
them, there was a conscious design decision taken, some of which took
a bit of discussion; each such decision has to be documented and
tested. Hence we really want the doctests. In particular, having an
attribute instead of a method would not save anything.
Cheers,
Nicolas
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Ticket URL: <http://trac.sagemath.org/ticket/16340#comment:70>
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